Imaging and Variability Studies of CTA 102 during the 2016 January gamma-ray Flare

doi:10.3847/1538-4357/aaa5ac

	Imaging and Variability Studies of CTA 102 during the 2016 January gamma-ray Flare
	Li, Xiaofeng 1,2,3; Mohan, P.1; An, T.1,4; Hong, Xiaoyu 1,2,4; Cheng, Xiaopeng 1,3; Yang, Jun 5; Zhang, Yingkang 1,3; Zhang, Zhongli 1,4; Zhao, Wei 1,4
刊名	ASTROPHYSICAL JOURNAL
	2018-02-10
卷号	854 期号:1 页码:12
关键词	galaxies: active galaxies: jets quasars: individual (CTA 102) relativistic processes techniques: high angular resolution
ISSN号	0004-637X
DOI	10.3847/1538-4357/aaa5ac
通讯作者	Mohan, P.(pmohan@shao.ac.cn)
英文摘要	The gamma-ray-bright blazar CTA 102 is studied using imaging (new 15 GHz and archival 43 GHz Very Long Baseline Array, VLBA data) and time variable optical flux density, polarization degree, and electric vector position angle (EVPA) spanning between 2015 June 1 and 2016 October 1, covering a prominent gamma-ray flare during 2016 January. The pc-scale jet indicates expansion with oscillatory features up to 17 mas. Component proper motions are in the range 0.04-0.33 mas yr(-1) with acceleration up to 1.2 mas followed by a slowing down beyond 1.5 mas. A jet bulk Lorentz factor >= 17.5, position angle of 128 degrees.3, inclination angle <= 6 degrees.6 and intrinsic half opening angle <= 1 degrees.8 are derived from the VLBA data. These inferences are employed in a helical jet model to infer long-term variability in flux density, polarization degree, EVPA, and a rotation of the Stokes Q and U parameters. A core distance of r(core,43 GHz) = 22.9 pc, and a magnetic field strength at 1 pc and the core location of 1.57 G and 0.07 G, respectively, are inferred using the core-shift method. The study is useful in the context of estimating jet parameters and in offering clues to distinguish mechanisms responsible for variability over different timescales.
WOS关键词	ACTIVE GALACTIC NUCLEI ; SCALE JET PROPERTIES ; BASE-LINE ARRAY ; AGN JETS ; GASP-WEBT ; INNER JET ; RADIO JET ; KINEMATICS ; QUASARS ; BLAZARS
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000424502900005
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/22268]
专题	中国科学院紫金山天文台
通讯作者	Mohan, P.
作者单位	1.Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 2.Shanghai Tech Univ, 100 Haike Rd, Shanghai 201210, Peoples R China 3.Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China 5.Chalmers Univ Technol, Dept Earth & Space Sci, Onsala Space Observ, SE-43992 Onsala, Sweden
推荐引用方式 GB/T 7714	Li, Xiaofeng,Mohan, P.,An, T.,et al. Imaging and Variability Studies of CTA 102 during the 2016 January gamma-ray Flare[J]. ASTROPHYSICAL JOURNAL,2018,854(1):12.
APA	Li, Xiaofeng.,Mohan, P..,An, T..,Hong, Xiaoyu.,Cheng, Xiaopeng.,...&Zhao, Wei.(2018).Imaging and Variability Studies of CTA 102 during the 2016 January gamma-ray Flare.ASTROPHYSICAL JOURNAL,854(1),12.
MLA	Li, Xiaofeng,et al."Imaging and Variability Studies of CTA 102 during the 2016 January gamma-ray Flare".ASTROPHYSICAL JOURNAL 854.1(2018):12.